I've used the following:
RECOMMENDED:
Endust for Electronics: Good at removing both dust and sticker gunk, also surprisingly good on sharpie marks (won't remove them entirely, but makes an impact). Make sure you have a well-ventilated room to use this one. I usually used this one with an old hand towel. It also works well on dusty CRT televisions (which is what I originally purchased it for).
Techspray Keyboard Cleaner: Probably my favorite from a bottle. Does the same thing Endust does but doesn't need as much ventilation (you'll want some, though). I have usually use Techspray with actual keyboard cleaning wipes. While I liked Endust, I have used this one for the past six years for most computer cleanings because it's easier to use in rooms/climates where window ventilation isn't always possible.
iKlear Apple Polish: I use this for displays, mostly. In particular, I've used it on LCDs, but if you use the wet one on a CRT it will do some good. This stuff is expensive but works very well. It comes in the form of towelettes (similar to the moist towelettes you get at restaurants or the alcohol pads used in medicine).
Read-Right Wipes: Again, a moist towelette, and one that is well-suited for cleaning heavily-soiled areas. I'm not sure if they still sell these, but they do work well.
NOT RECOMMENDED
Mr. Clean Magic Erasers: Don't get me wrong, they have some good purposes. However, cleaning Mac cases are not one of them, as they remove the top layer of plastic when used. They may make the computer nice and shiny and could lighten it up a bit, but you'll be dealing with uneven texture and an odd shine.
RECOMMENDED:
Endust for Electronics: Good at removing both dust and sticker gunk, also surprisingly good on sharpie marks (won't remove them entirely, but makes an impact). Make sure you have a well-ventilated room to use this one. I usually used this one with an old hand towel. It also works well on dusty CRT televisions (which is what I originally purchased it for).
Techspray Keyboard Cleaner: Probably my favorite from a bottle. Does the same thing Endust does but doesn't need as much ventilation (you'll want some, though). I have usually use Techspray with actual keyboard cleaning wipes. While I liked Endust, I have used this one for the past six years for most computer cleanings because it's easier to use in rooms/climates where window ventilation isn't always possible.
iKlear Apple Polish: I use this for displays, mostly. In particular, I've used it on LCDs, but if you use the wet one on a CRT it will do some good. This stuff is expensive but works very well. It comes in the form of towelettes (similar to the moist towelettes you get at restaurants or the alcohol pads used in medicine).
Read-Right Wipes: Again, a moist towelette, and one that is well-suited for cleaning heavily-soiled areas. I'm not sure if they still sell these, but they do work well.
NOT RECOMMENDED
Mr. Clean Magic Erasers: Don't get me wrong, they have some good purposes. However, cleaning Mac cases are not one of them, as they remove the top layer of plastic when used. They may make the computer nice and shiny and could lighten it up a bit, but you'll be dealing with uneven texture and an odd shine.